P0420
Catalyst System Efficiency Below Threshold (Bank 1)
Affects: Tiggo 4, Tiggo 7, Tiggo 8, Arrizo 5
Common Causes
- •Faulty catalytic converter
- •Defective oxygen sensor (O2 sensor)
- •Engine misfire
- •Exhaust leak before catalytic converter
How to Fix
- 1Check O2 sensor readings with OBD2 scanner
- 2Inspect exhaust system for leaks
- 3Test catalytic converter efficiency
- 4Replace faulty O2 sensor or catalytic converter
Estimated Repair Cost (Australia)
$300 - $1500
AUD
*Cost varies by model, location, and service provider. Get multiple quotes.
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